If you havent yet, do try the Nokia Play To App with your Xbox 360. The 2012 Xbox holiday update (now public) carries full DLNA DMR support. The Nokia Play To app works great with it.
Xbox Play To Support:
Play To | Play to on Xbox | Streaming media on Xbox - Xbox.com
DLNA Site:
Product Search
Xbox Play To Support:
Play To | Play to on Xbox | Streaming media on Xbox - Xbox.com
DLNA Site:
Product Search